fix: remove flag that is no longer supported

[marcusdufrane]

Description

The --no-color flag has been removed from the latest coderabbit cli

Fix for reported issue #27

Summary by CodeRabbit

• Bug Fixes
  • Improved review command output by removing an unnecessary colour-disabling option.

[coderabbitai]

📝 Walkthrough

Walkthrough

The cr review --agent command no longer includes the --no-color argument.

Changes

CLI command construction

Layer / File(s)	Summary
Review command arguments lua/coderabbit/cli.lua	The constructed review command no longer includes --no-color.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarises the removal of the unsupported --no-color flag.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

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